NEW YORK -- People all over a large part of New York City are smelling a gas, and it's not clear where it's coming from.

Numerous people have called 911 concerned about the odor. Con Edison, the Fire Department and the U.S. Coast Guard are investigating.
People between Midtown and Battery Park are reported to be smelling it. At NBC headquarters in Rockefeller Plaza, the odor is very strong. One person who works on the sixth floor at 30 Rockefeller Center says it's so strong people are leaving the building.

At one major office building at 37th and 7th, employees have been told that Con Edison is looking into a smell, and they should remain inside until they hear otherwise.

Mayor Bloomberg is expected to be asked about it at a 9:30 briefing with the media.

Keep checking WNBC.com for any information as soon as it becomes available.